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Widiarso Dian Agus
Program Studi Teknik Geologi Universitas Diponegoro, Semarang
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HUBUNGAN KONDISI GEOLOGI TERHADAP ALTERASI HIDROTERMAL DAN MINERALISASI PADA ENDAPAN EPITERMAL DAERAH BUNIKASIH, KECAMATAN TALEGONG, KABUPATEN GARUT, PROVINSI JAWA BARAT Saumi Rahmawati; Hadi Nugroho; Dian Agus Widiarso; Okky Verdiansyah
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Hydrothermal alteration is a changed in the mineral composition of the rock as a result of interaction of hydrothermal fluids with the wall rock involving various geological environments like fault zones and volcanic eruptions zones. Hydrothermal alteration has a very close relationship with the mineralization. Mineralization is a process of inclusion of valuable rare minerals in rocks that form ore deposits. The purpose of this study is to determine the geological conditions of the mapping area and knowing the type of alteration and the relationship between alteration with the developing of ore mineralization. Research methods include field observations survey and continued by analysis methods, conducted in Bunikasih and surrounding areas, Talegong District, Garut regency, West Java. Methods of analysis undertaken include petrology, petrography, Terraspec, and structure analysis. Geological conditions of the study area consists geomorphological unit of structural steep hills and undulating hills of volcanic units (Van Zuidam, 1983). The research area is composed by rocks from old to young volcanic breccia, Andesite Lava, and tuff. Geological structures that are left slip fault of North Cibaliung, right slip thrust fault of South Cibaliung, right slip normal fault of Citutugan-Cibaliung Beet. There are prophylitic alteration (smectite, chlorite, ±illite), argillic (kaolinite, illite, smectite), advanced argillic (kaolinite, illite, alunite, silica), and silicification (vein zone). In the study area there are two types of epithermal, low sulfidation epithermal zone on Bunikasih mineralized was found that quartz manganese vein, chalcedonic vein, crustiform-colloform banded vein, and disseminated pyrite. there are 5 main vein lines with 40-100cm of thickness with a northwest-southeast direction formed on andesite and tuff, due to the style of the extensions that form the structure openings fault trending Northwest-Southeast. At high sulphidation epithermal indication zone in Datarkorot is dominated by advanced argillic alteration. Mineralization occurred is in the disseminated pyrite form and the concentrated hematite oxide mineral, goethite, and jarosite is a condition of changing sulfide mineral acids. Mineralization is controlled by lithology, by tuff unit which is interpreted lithocap of a diaterme breccia generated by a dacite porphyry intrusion.
ANALISIS POTENSI ALIRAN AIRTANAH BERDASARKAN DELINEASI NILAI PERMEABILITAS SEKUNDER, PADA TAMBANG BAWAH PERMUKAAN, CIURUG CENTRAL L. 500, UNIT BISNIS PERTAMBANGAN EMAS, PT. ANEKA TAMBANG TBK, PONGKOR, KABUPATEN BOGOR, JAWA BARAT Neli Nikla Iklima; Henarno Pudjihardjo; Dian Agus Widiarso; Yosep Purnama
Geological Engineering E-Journal Vol 5, No 2 (2013): Volume 5, Nomor 2, Tahun 2013
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Kegiatan penambangan emas yang dilakukan oleh PT. Aneka Tambang Tbk, yang berlokasi di Desa Bantar Karet, Kabupaten Bogor, Jawa Barat, berupa pertambangan tertutup, yaitu pembuatan terowongan bawah tanah untuk pengambilan bijih emas. Penghancuran bijih emas dilakukan dengan metode blasting (peledakan) yang dilakukan pada dinding terowongan yang kerap menimbulkan masalah yang sulit diatasi, yaitu airtanah yang tiba-tiba keluar dengan debit tertentu. Akumulasi dari airtanah akan membentuk genangan air, terutama air yang keluar dengan debit besar, akan sangat mengganggu aktifitas pertambangan seperti gangguan aktivitas pekerja serta gangguan lingkungan seperti banjir.Untuk mengatasi permasalahan airtanah dalam terowongan bawah tanah diperlukan kajian hidrogeologi untuk mengetahui potensi aliran airtanah, berdasarkan besarnya nilai permeabilitas sekunder. Nilai permeabilitas sekunder didapatkan melalui metode scanline, yaitu metode pengukuran rekahan dengan membentangkan tali pada dinding terowongan yang terdapat banyak rekahan dengan panjang dan kemiringan tertentu. Rekahan yang terpotong oleh bentangan tali tersebut diukur besar strike dan dip-nya, serta diamati karakteristik rekahannya, seperti bukaan rekahan (aperture), jarak (spasi), kemenerusan (lenght), material pengisi, bentuk (shape), dan kekasaran (rough).Metode scanline dilakukan pada dinding terowongan yang basah, meneteskan air, dan mengalirkan air. Pada lokasi ramp down (jalur menurun) elevasi 450 (RY – 01), didapatkan hasil permeabilitas rata-rata sebesar 3.6 x 10-4 m/s. Untuk dinding yang teraliri oleh air, nilai permeabilitas yang didapat adalah nilai permeabilitas tertinggi yaitu 2.6 x 10-3 m/s. Sedangkan untuk akses ramp down elevasi 500 (RY – 02) didapatkan nilai permeabilitas yang lebih rendah yaitu 1.3 x 10-5 m/s. Potensi aliran airtanah tertinggi berada pada lokasi RY-01 yaitu STA 3 dan STA 6. Pada kedua stasiun pengamatan ini ditemukan aliran airtanah dengan debit yang kecil, dan untuk STA 6 merupakan akumulasi arah aliran airtanah pada peta kontur MAT. Berdasarkan nilai permeabilitas sekunder dan karakteristik rekahan dari kedua lokasi ini, lokasi RY – 01 memiliki potensi yang lebih besar untuk mengalirkan air, dibandingkan pada lokasi RY – 02.
MIKROFASIES BATUGAMPING FORMASI BULU DAN KUALITAS BAHAN BAKU SEMEN, PADA LAPANGAN GUNUNG “PAYUNG”, KECAMATAN BOGOREJO, KABUPATEN BLORA JAWA TENGAH Ajidityo Putro Fadhlillah; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 2 (2014): Wisuda Periode Juli - Oktober 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Bulu Formation is one of formation which is sedimented at Tertiary age in The North East Java Basin. Bulu Formation has a lithological composition of limestones with kalkarenit. Bulu Formation is located in Gandu village, Tahunan Village, and the surrounding areas, District Bogorejo, Blora, Central Java, with a particular study on the "Gunung Payung".The study aimed to determine microfasies, facies zone, the relative age, and standart of quality limestone as materials cement on data petrographic, paleontologist, and chemical analysis of limestone samples in the study area. Development of Limestone Bulu Formation Unit microfacies is Bioclast Red Algae Packstone, Bioclast Large Foram Grainstone, Bioclast Large Foram Packstone, Bioclast Planktonic Foram Packstone, Bioclast Grainstone with dolomitation, Planktonic Forams Grainstone, Planktonic Wackstone, Peloidal Wackestone, Packstone with dolomitation, Bioclast Wackstone with microspar, Bioclast Planktonic Foram Wackstone, Bioclast Wackstone with dolomitation, Bioclast Packstone with dolomitation, and Dolomite limestone.Based on the analysis microfacies and foraminifera on the areas of research, there are 3 types of facies zoning based on the model of Wilson (1975), namely: FZ 5 Platform - Margin Reefs, Marine Open 7 FZ, FZ 8 Platform and Interior - Restricted to the age of rocks between N9 to N12 is the Middle Miocene. From the chemical analysis, the potential limestones in the study area can be used as raw material for cement and relationships microfacies analysis and chemical analysis showed that the pitch "Gunung Payung" has a great potential in terms of good quality which is spread of West to East direction. The west area of “Gunung Payung” has better quality of limestone as a raw material for cement than east area.
GEOLOGI DAN ALTERASI HIDROTERMAL DAERAH BANTAR KARET DAN SEKITARNYA, KECAMATAN NANGGUNG, KABUPATEN BOGOR, PROVINSI JAWA BARAT Rizal Dwi Febriyana; Yoga Aribowo; Dian Agus Widiarso
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Program Studi Teknik Geologi, Fakultas Teknik, Universitas Diponegoro

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Abstract

Alteration type at zone of mineralization has its own properties and characteristics that often characterized by the presence of mineral assemblage. The existence of alteration zone occurred due to changes mineral composition of rocks as a result of interaction between fluida of hydrothermal and wall-rocks. Alteration of hydrothermal is very closely linked with mineralization. Mineralization is an assembly and accumulation process of valuable rare minerals in the rocks to form ore deposits. Geological studies related to the characteristics and distribution of alteration and mineralization will assist in the planning of exploration process in the area. The aim of this study is to know the condition of geological research area that include variation of morphology, stratigraphy, structural of geology, alteration types are develop in the study area, as well as the relationship between altered minerals the result of hydrothermal alteration to precipitate epithermal mineralization in the study area.The methods used in this study include field mapping, followed by the method of sample analysis. Method of field mapping carried out by observing the lithology, structural of geology, geomorphology and alteration at Bantar Karet and surrounding areas, Nanggung subdistrict, Bogor Regency, West Java . Method of analysis carried out by analysis of petrology, petrography, mineralgraphy , X - ray diffractometer and the structure analysis of the lineament pattern.Lithology of the research area, beginning Early Miocene with sequence from old to young are unit of laminated tuff, unit of volcanic breccia, unit of andesite lava, unit of lapilli tuff, unit of tuff and unit of dacite intrusion. Structural of geology that develop in the study area are joint, fault that related with the lineament pattern, the main direction are Southwest-Northeast and Northwest-Southeast. Geomorphology of the study area was divided into two : the unit of volcanic landforms are very steep mountains and the unit of volcanic landforms are steep hilly. Alteration zones are contained in the study area, becoming three zones, there are Chlorite ± Smectite Alteration Zone (Propylitic), Smectite Alteration Zone - Kaolinite ± Montmorillonite (Argillic) and Silicified Zones. The mineralization exist are dessiminated Pyrite as ore mineral and oxide mineral such as Hematite which is the alteration of Magnetite and Feromagnesian on temperature conditions < 260oC. Characteristics of deposition types that developed in the study area based on the identification of geology, included alteration and mineralization is low sulphidation epithermal.
ANALISIS KESTABILAN LERENG MENGGUNAKAN METODE ROCK MASS RATING, SLOPE MASS RATING, DAN JANBU PADA JALAN SUMBING, KELURAHAN BENDUNGAN, KECAMATAN GAJAHMUNGKUR, KOTA SEMARANG Herfaes, Bey Anandha; Giraldi, Devina Aldalivia Budhi; Yasmin, Lutfia; Widiarso, Dian Agus
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.153

Abstract

Kestabilan lereng merupakan suatu kondisi atau keadaan yang mantap atau stabil terhadap suatu bentuk dan dimensi lereng. Gerakan tanah yang terjadi di Indonesia setiap tahunnya mengalami peningkatan terutama pada musim hujan. Pergerakan massa tanah merupakan suatu proses geologi yang dimana merupakan hasil interaksi kondisi yang terjadi pada suatu lingkungan seperti morfologi, geologi, struktur geologi, hidrogeologi, dan penggunaan lahan. Selain itu, terdapat juga pengaruh dari kondisi tektonik yang ada diIndonesia, yang dimana kondisi tektonik ini menyebabkan terbentuknya kenampakan morfologi berupa tinggian, patahan, batuan yang mudah lapuk yang dikarenakan adanya pengaruh iklim tropis, sehingga menyebabkan potensi gerakan tanah semakin tinggi. Selain itu, adanya faktor pertumbuhan penduduk yangsangat pesat, dapat memberikan dampak juga pada perubahaan tata guna lahan, sehingga mengakibatkanbencana gerakan tanah akan semakin meningkat. Keruntuhan pada lereng alami atau buatan disebabkan karena adanya perubahan antara lain topografi, seismik, aliran air tanah, kehilangan kekuatan, perubahan tegangan, dan musim / iklim / cuaca. Akibat adanya gaya-gaya luar yang bekerja pada material pembentuk lerengmenyebbakan material pembentuk lereng mempunyai kecenderungan untuk menggelincir. Kata kunci: Lereng; Tanah; Tektonik; GeologKOTASEMARANG
ANALISIS POTENSI BENCANA LONGSOR MENGGUNAKAN METODE KINEMATIK DI DESA JABUNGAN, KOTA SEMARANG Perkasa, Leony Isda; Dirostrimila, Najwa Humaira; Soputan, Puspo Anggreiny Putri; Widiarso, Dian Agus
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.154

Abstract

Research area is a residential area located in Jabungan, Banyumanik, Semarang, Central Java. The research focuses on analyzing the potential of landslides that can occur. The research slope is located with residential areas and roads. Based on the potential damage that can occur if the slope slides become the background of this study. Near the research location which is a residential area and roads, the slope stability factor needs to be considered because a stable slope causes the slope to be safe and there is less possibility of landslides. Landslide is the movement of the soil mass or the expanse of experience plane or a shear surface plane. The types of landslides have a relationship with the geological structures that cause discontinuities in a rock mass. One of the steps to determine the possibility of landslides from a slope is the kinematic analysis method. Kinematic analysis is carried out with the aim of knowing the types of landslides that may occur. After doing kinematic analysis, the slope is possible for landslides to occur. By knowing the potential of landslides, it can be used as a basis for mitigation so that landslides not occur in the area that can cause losses.
ANALISIS TINGKAT KELONGSORAN MENGGUNAKAN METODE ROCK MASS RATING (RMR) , SLOPE MASS RATING (SMR) SERTA METODE BISHOP PADA LERENG BATUAN X, KELURAHAN JANGLI, KECAMATAN TEMBALANG, KOTA SEMARANG Nickolas, Syafrichard Ihsan; Nurfaizi, Nick; Husain, Habib; Widiarso, Dian Agus
JURNAL GEOMINERBA (JURNAL GEOLOGI, MINERAL DAN BATUBARA) Vol 9 No 1 (2024): Jurnal Geominerba - 2024
Publisher : PPSDM Geominerba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58522/ppsdm22.v9i1.155

Abstract

Kawasan penelitian berlokasi di Kelurahan Jangli, Kecamatan Tembalang, Kota Semarang. Kawasan ini berada dekat dengan kawasan pemukiman sehingga faktor keamanan lereng menjadi faktor penting yang harus diperhatikan. Lereng batuan yang aman dari longsor tentunya harus memenuhi berbagai kriteria dan pembobotan tertentu sesuai dengan metode yang digunakan. Longsor merupakan pergerakan massa tanah atau batuan sepanjang bidang tergelincir atau suatu permukaan bidang geser. Terjadinya suatu peristiwa tanah longsor tentunya disebabkan oleh berbagai faktor-faktor alam seperti adanya peran dari struktur geologi, mekanika batuan, kuat tekan batuan, maupun faktor geologi lainnya. Adapun penelitian kali ini memiliki fokus utama terkait dengan analisis RMR dan SMR dan penggunaan metode Bishop dalam mengidentifikasi tingkat kelongsoran lereng batuan penelitian. Dari penelitian yang telah dilakukan, diketahui bahwasanya pada metode RMR didapati nilai pembobotan sebesar 72 yang, menurut klasifikasi Bieniawski (1989), termasuk dalam kelas II atau "Pemerian Baik". Sementara dalam analisis SMR, hasil perhitungan mengungkapkan persentase kinematika wedge sliding sebesar 0,62%. Pembobotan F1, F2, F3, dan F4 menghasilkan nilai SMR sebesar 86,1, yang secara klasifikasi dikategorikan sebagai "very good" atau "sangat baik". Hasil pengolahan data dengan menggunakan Metode Bishop juga menunjukkan nilai kondisi lereng yang aman, baik dalam kondisi kering maupun kondisi jenuh, di mana nilai yang diperoleh menunjukkan FK>1,25. Dengan demikian, bahwa kondisi massa batuan di lokasi tersebut sangat stabil, dengan potensi kegagalan atau longsoran yang rendah
Analisis Kualitas Air Tanah Akuifer Bebas Menggunakan Metode Indeks Pencemaran (IP) dan Water Quality Index (WQI) di Kota Semarang, Jawa Tengah Anggraeni, Wahyu Dini; Santi, Narulita; Putranto, Thomas Triadi; Widiarso, Dian Agus
Jurnal Geosains dan Remote Sensing Vol 6 No 1 (2025): JGRS Edisi Mei
Publisher : Department of Geophysical Engineering, Faculty of Engineering, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jgrs.ft.unila.417

Abstract

Air tanah menjadi salah satu kebutuhan masyarakat, Kota Semarang setidaknya membutuhkan air bersih sebanyak 61,7 m3 setiap tahunnya. Oleh karena itu, kualitas air tanah harus diperhatikan untuk memenuhi kebutuhan air bersih masyarakat. Penelitian bertujuan untuk mengetahui kondisi geologi, geomorfologi, hidrogeologi, kualitas air tanah, serta faktor yang berpengaruh terhadap kualitas air tanah di Kota Semarang tepatnya pada 11 kecamatan. Sebanyak 30 sampel sumur gali dilakukan analisis menggunakan metode Indeks Pencemaran (IP) dan Water Quality Index (WQI) dengan standar baku mengacu pada Permenkes Nomor 2 Tahun 2023 dan WHO (2022). Hasil penelitian menunjukkan keterdapatan litologi aluvium dan konglomerat di daerah penelitian, bentuk lahan terbagi menjadi bergelombang landai denudasional, bergelombang miring denudasional, dan berbukit bergelombang denudasional, sedangkan aliran muka air tanah daerah penelitian menuju ke arah utara tepatnya ke arah Laut Jawa. Kualitas air tanah dengan metode IP menunjukkan nilai 0,61-7,96 dimana terbagi menjadi 3 kategori yakni kondisi baik, cemar ringan, dan cemar sedang. Kualitas air tanah berdasarkan metode WQI dengan standar baku Permenkes (2023) menunjukkan nilai 33,5-1458,36, sedangkan standar baku WHO (2022) menunjukkan nilai 19,59-978,96, kedua standar baku menunjukkan kualitas air tanah terbagi menjadi kategori sangat baik, baik, buruk, sangat buruk, dan tidak layak minum. Air tanah dengan kualitas relatif baik terdapat pada Kecamatan Ngaliyan dan Gajahmungkur.
Active Tectonics of the Garsela Fault Utilizing Morphotectonics and Seismicity in Garut Regency, Indonesia Pristiwantoro, Rafa Nurul Zahra; Fahrudin; Widiarso, Dian Agus; Moechtar, Rio Alcanadre Tanjung; Cita, Akbar
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.20209

Abstract

Tectonic activity along active faults in Indonesia has a high potential to cause earthquakes with magnitudes greater than 6.5. This research focuses on the Garsela Fault in Garut Regency, West Java, which has a history of shallow earthquakes occuring near nationally important infrastructure. Morphotectonic analysis, Maximum Credible Earthquake (MCE) calculations, geological structure measurements, and subsurface condition assessments were conducted to determine the tectonic activity around the Garsela Fault and its fault mechanism. The analysis results show that tectonic activity in Garut Regency ranges from low to high. The Garsela Fault is divided into two segments with different fault systems: the Rakutai Segment, a normal fault (16.22 km), and the Kencana Segment, a strike-slip fault (17.33 km). MCE calculations for the Garsela Fault indicate potential maximum magnitudes of 5.42, 5.54, 6.28, and 6.54. Shallow earthquakes may produce stronger tremors in the western part of the Rakutai Segment compared to the east. In addition, earthquakes originating from the Kencana Segment may also generate tremors in the southern part of Garut Regency.
Co-Authors Agnis Triahadini, Agnis Agus Setyawan Ainul Fatayatis Salamah Ajidityo Putro Fadhlillah Ajidityo Putro Fadhlillah Alif Febriansyah Alif Febriansyah Andi Kurniawan Anggraeni, Wahyu Dini Arie Noor Rakhman Bagus Zaqqie Betraz A Cita, Akbar Dirostrimila, Najwa Humaira F.X. Yudi Triyono Fachrul Rozi Ramadhan Fadhlillah, Ajiditya Putro fahrudin Fatir Yuslihanu, Fatir Giraldi, Devina Aldalivia Budhi Gregorius Agung Chrishartantyo Hadi Nugroho Hadi Nugroho Herfaes, Bey Anandha Husain, Habib Istiqomah Ari Kusuma, Istiqomah Ari Lutfi Hakim Moechtar, Rio Alcanadre Tanjung Mohammad Tommy Agus Binsar Neli Nikla Iklima Neli Nikla Iklima Nickolas, Syafrichard Ihsan Nurfaizi, Nick Okky Verdiansyah Okky Verdiansyah Perkasa, Leony Isda Prabowo Wahyu Prakosa Rachwibowo Pristiwantoro, Rafa Nurul Zahra Pudjihardjo Henarno Ragil Pratiwi Ragil Pratiwi Rana Lesmana Rana Lesmana Rinal Khaidar Ali Rio Andryantoro Rizal Dwi Febriyana Rizal Dwi Febriyana Rizki Trisna Hutami Santi, Narulita Saumi Rahmawati Saumi Rahmawati Soputan, Puspo Anggreiny Putri Suprapto, Rachdian Eko Thomas Triadi Putranto, Thomas Triadi Tri Winarno Wahju Krisna Hidajat Yasmin, Lutfia Yayan Yuliananto Yoga Aribowo Yoga Aribowo Yosep Purnama Yosep Purnama